In Fig. 2.16,


(a) AOD is a/an _____ angle


(b) COA is a/an _____ angle


(c) AOE is a/an _____ angle


(a) Right


(b) acute


(c) obtuse


AOD = 90 (40+20+30)


COA = 50 (20+30) (less than 90, which makes it acute)


AOE = 130 (40+40+20+30) (between 90 and 180 which makes it obtuse.)


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